Screeding and compacting machine for concrete slabs and the like



Nov. 9, 1948. c. JACKSON 2,453,510 SCREEDING AND COMPACTING MACHINE FOR CONCRETE SLABS AND THE LIKE Filed Sept. 17, 1945 4 Sheets-Sheet 1 m, W R. 5 R y M N r @w 4 m C. JACKSON SCREEDING AND COMPACTING MACHINE FOR CONCRETE SLABS AND THE LIKE Nov. 9, 1948.

4 Sheets-Sheejz 2 INVENTORQ Kora/1M a/aafldazz Filed Sept. 1'7, 1945 Nov. 9, 1948. Q JACKSON SCREEDING AND COMPACTING MACHINE FOR CONCRETE SLABS AND THE LIKE Filed Sept. 17, 1945 4 Sheets-Sheet 3 box-III H km N k 1 w m w Kw R m I m M IF" A w NW. 9, 1948. c. JACKSON SCREEDING AND COMPACTING MACHINE FOR CONCRETE SLABS AND THE LIKE- 4 Sheets-5heet 4 Filed Sept. 17, 1945 JNVENTOR. Cora/[[1 Jae/won www A TTOR NE 115.

Patented Nov. 9, 1948 I i I 2,453,510. a b b DI NG AND COMPACTINGMAGHINE a i.

FOR CONCEETESLABS'AND THE i Corwill i Jackson, Ludington, Mich., assignor to Jackson Vibrators, Inc., Ludington, Mich., a. corporation OfMichigan Application September 17, 1945, Serial No..616,837:

v .15 Claims. 1

This invention. relates to improvements in screeding and compacting machine: for'concrete i slabs and the like.

The main objects of .thisinvention are:

First; to provide amachine orapparatus for the screeding and compacting of concretein pavements or'thel like. which is'xcomparatively ecoznomical in? structure; may be embodied as an attachment for" at concrete distributing: machine, andone whichis practical tormanipulate' by hand.

Second, to pI'OVldGli a. vibrated. screeding and compacting machine: which though simple and economical. in structure: is highly! eificient 'both in: screeding and in: compacting of the concrete.

Third, toprovide axmachine or device of this character'which may. be effectively used in the placing of concrete mixtures of: low water content. a

Fourth, to provide 'a machine of'this character irrwhich an internalicombustion engine may be employed as a sourceofpower'forthe vibrated elements, the engine being supported sothat'it is'inot'subject to objectionablevibrations :Objects relatingto'ridetails: and economies of the? inventioir will. appear: from. the description to follow; Theinvention is: defined: and? pointed out in theclaimsz'm i l Preferred"embodiments off. the. invention are illustrated in: the accompanying drawings; in which: r i 1 i Fig: 1 is a. fragmentary-side elevation of. a 1 structure embodying, my invention shown in; operative relation to a concrete distributing-1 mas chine; only a fragment of which is-il1ustratedl Fig; 2-is an enlargedfragmentaryview 11115605- 11011011 line 22 of Fig. 4. r i i x b a :Fig'. 3 is a fragmentary rear elevational view of the embodiment of. my invention shown: in Figs. 1= and 2zt- Fig. .4 is a f ragmentary plan-view-il1ustrating therrelation of the front. and rear screeding and vibrating members showing the; relationpthereof to :concrete .tobe treated-r i q i Fig. i 5 is airagmentary View in :lvertical. transverse sectionthrough the bedofconcrete and oneof the, forms, showing'a. modif ed relationshipof the parts with respect to the forms the view being. similar to the leftsides of Rig. 3; Fig. fi is afrag mentaryend elevationvofla modifled i form of structure showing the relationship of; the, screeding and vibratory members to the bedof concrete. i ,E'ig. .Iis a rear elevationiof. a modified iormor embodiment of the.=.invention' as em bodiedin a structure designed .to be manipulated by hand it or asahand screeding. machine. b c

,Fig. 8 is an enlargedlsectional,viewon line 89-8 ofEigJ; I j 1 b Fig.9 is alfraglmenta'ry view partially in, horizontalllsection.on,line. 9+ 9 of.- 1i;ig.,8:

1 Big. IOQiS L-airaQmentaryperspective view illus (Cl. 94-48) X z 3 trating further details and; adaptations of my invention in which the rear vibratory member: is provided with shoes for supporting it in elevated positionnrelative to the concretefito betreated in which i position it merelyyserves as a supporting: V bridge-like supporting. member for theinternal combustion motor orienginet j b r Fig it 11 is anenlarged-fragmentary view-spar tially in section on the broken liner I] ll of- Fig.12.

i Fig. 12. is bodimentshowrr in Fig. 10.1 ,1 1 1 Fig; 13, is a .perspectivewview of; an elevating,

shoeforlthe rear vibratory member-=-adlaptedlto convert thememberlto her. b t b In the embodiment of; my inventionyillustrated in Figs. 1 to 5 inclusive of the accompanying drawings; 1| represents a? concrete spreadingj machine or: other-suitable tractors mean-s provided witha draw headga-having pairs of" rear-weirdly projecting cars 3 and y lz to: which the; combined draftand supporting bars Brand .61 are connected by means of pivot'boltsfh 'I-herear-ends:offthese bars 5* and: 6: are connecteidito the: crosshaid? 8 by means -01 the bclts srthe-crosshead ihavingpfor wardly projecting ears Ill. The draw bars in this arrangement havea: parallel movement. A .hydraulic. lift H isprovided; onevmembemof: this being connected ,tothe: IQWBIY dIQIW'I' bolt 'l 7 while. the-other member: is' connected lat" l-2-to a; central ear-13 on'theupper draw bar: m

In the embodiment: illustrated, in; these. Figs:

1 to 5, theyfr0nt"or main vibratory strike ofinl4 is provided :Wlth. arshoe- I 5''; the vibra-toryrmember l4 being preferably in the form-ofvai plank disposed vertically on: edge,- the shoe being& of general U-shape andvreceivina the lower edgeioi the vibratory member and secured th'eretoibyrthe The rear combined vibratory member and bridging member. IT is spaced rearwardly ofthe front member, at: least: tosuch an: extent asnto provide a stable structureI-that isjeone Y that remains in upright position, This member H is preferably of substantially lessdepthit'han the front member; being: also formed of plank" or piece? of' timber arranged vertically. on: edge; and provided with a: shoe li5. Thei frontr' andtrear ed es ofgthewshoe" I5 are shown as rounded;

abridgingsupport merrii The front and rear members are connected'by sections of reinf'orcedatubing l8; the? ends: of :this tubing being secured tothe" adjacent sides: of the frontandarearmembers' which have studs I9 projecting therefrom to receive theiends: of? these members [8; the ends-being clamped" uponthe studs by means ofclamps 20:, 4 Therear member H" is provided with albracket t2 2iprovided with a* platforrnz 23 toiwhichrthezhase 24 of the internal combustioneng ine 25 isirse cured. The shaft 26 otthewengine ze .is providcd a-frag mentary end view oi -.the emwith a pulley21 connected by thebelts 28 to'the' pulley 29 on the shaft 30 (see Fig. 9), this shaft being provided with an unbalancing weight 3! arranged in a suitable housing 32 rigidly bolted to the rear side of the front vibrating and screeding member [4. With this arrangement the main bodiments the front and rear members are resil- ,iently connected in the manner described, the tie bars 50 being'connected at its front end to the force of the vibrations are imparted to the front member (4, the only vibrations impartedto the rear member ll being such as are transmitted through the yieldable connections l8, and in the commercial embodiment abut90% of the vibra tions are imparted to the front member as com pared to to the rear member. This amount of vibration in the rear member is not objection able so far as vibrating the engine is concerned. This assembly isconnected to the draw bar crosshead '8 through vibration absorbing means-- that illustrated comprising pairs of resilient tubular members 33, see Figs. 2,4, and 11, arranged onopposite sides of the member I4 andsecured at their ends thereto by means of studs and clamps 35, the studs being carried by brackets 36 bolted to the sides of the member I4, see Fig. 11, which shows part of the connection in detail.

Couplings 31 are clamped to the members 33 intermediate the ends thereof, reinforcing inserts 38 being provided within the tubes to prevent the collapsing thereof; These couplings are connected by a yoke-shaped bridging member 39 extending over the member I4, these members being connected by the brackets 40 to the draw bar crossheads. 4

'Bra'cing bars 4I- extend from the upper ends of connected. to the brackets 52 projecting forwardly the draw bar crosshead to the member I! but these are of steel of such flexibility as to permit such vibrations of the'rear member l1 asis desired. This connection to the draw bar crosshead permits the raising and lowering of the unit to the desired position and the supporting of it in elevated position through the hydraulic lift means ":It is sometimesdesired to support the unit to ride upon-'theside or form rails 43, as is shown in Fig -3, and itis sometimes desired to support it between these rails'or form members as is shown in Fig. 5, the mass of concrete being indicated at 44; To'support'it-in a predetermined position relative to the'material to be treated, I provide supporting brackets 45 having adjustable rests 46' for the upper draw bars 5, these rests having threaded engagement with the brackets 45 and being'secured in their adjusted position by the lock nuts 41; r

This embodiment illustrated is, as stated, de-

keep it-upright and to provide a bridging support for:'- .the engine. 'While the structure is quite economical to produce it is highly efficient and enables the use of an internal combustion engine as a: source of power for the vibrating means.

mIn'the embodiment shown'in Fig. 6, the front member I4 is provided with an angled wear plate 48 in lieu of the shoe l5 shown in the embodiments of Figs. 1 to 5 inclusive. This presents a relativelynarrow edge to the concrete surface which is effective as a strike-off and has some advantages as a strike-off.

yokes 39, otherwise the connections for the parts are substantially as described. Instead of conmeeting the unit to the crosshead 8 of the draw bars Iprovide handles 5| which are pivotally from the yoke 39. This enables the swinging of the handles to the position shown in Fig. 7 as draft members or they may be swung in a lateral direction to facilitate the reciprocation of the screed unit back and forth with both members supported by the forms 43.

Sometimes it is desired to elevate the rear member I labove the concrete mass and to accomplish that I provide the shoes 53 which are of substantial length so that the structure may be re'ciprcoated'back and forth on the supporting rails." These shoes are detachably secured to the rear member by'mean-s of the bolts. 54, see Figs. 10 and 12. In this embodiment, the rear or trailing member serves as a supportfor the engine, the support bridging across from one form tothe other and keeping the structure in upright positi'on as it is manipulated by the handles.

To facilitate the handling of the unit, I pro-: vide the members'Mand H with brackets 55 and 56 respectively projecting from the ends thereof. and having holes therein adapted to receive bars or rods which constitute-handles for transporting or carrying the unit or positioning it on the form members. I f

I have illustrated and described my invention in practical commercial embodiments as 'a power operated unit and also as a hand operated unit. I have not attempted to' illustrate 'or describe other embodiments or adaptations which I eontemplate. as it is believed that this disclosure will enable those skilled in the art to embody or adapt my invention as may bedesired. f

Having thus described my invention, what I claim as new and desire to secure byLetters Patent,is:- I

1. In a machine for screeding and compacting concrete, the combination of "a plank-shaped front vibratory screed member disposed vertically edgewise, a plank-like rear motor support and vibratorymember disposed vertically edgewise in substantially rearwardly spaced relation to said front member, resilient non extensilble connections between said "front and rear members whereby they coast to mutually support each other in upright positionfan unbalanced rotor mounted on-said front member;amot or mounted on the rear memlber and having a flexible driving connection to said rot-or; said connections between said front and rear'm'embers constituting a vibration dampening means whereby the vibrations of the rearmember are relatively slight as compared to the vibrations of the front member, a draw head, pairs of'draft bars pivotally connected to said draw head for vertical swinging move ment, crossheads f orthe rear'ends of said pairs of drawbars, vibration absorbing means'support a resilient brace connecting the upper ends of "said crossheads to. the, rear ;me mlber,, means for raising and lowering the "swinging ends 0f said draw bars, andadjustable stop means'on said at ia-m tions between said;- front" and rear members whereby" theyl coact to mutually; support each other in upright position; an unbalanced rot-or mbuntedon said fronttmember, a motor mounted on thezrearamembn'and having"-a flexible 'driving cbnnectionato saidrotor; said connections between said front and rear members constitutingia vi brationi dampening. means 1 whereby the. vibrations-ofthe'rear' member are 'reiativ'ely slight 1 as compared-std the vibrations of'the front member, azdrazw head, pairs of 'draft' bars pivotall-y connected to said draw head for vertical swinging movement; crossheads for the rear ends of said pairs: ofs"idraw"= bars; vibration absorbing means supportingly connecting, said front vibratory screedimemberto said 'crosshead-s forraising 'and loweringi said front vibratory 1 member with said cros'sheads, meansforfraising and loweringithe swinging ends of said draw bars, and adjustable stop: means on; said draw head for limiting the downward fmovement of s'aid draft bars. l 3: 111. alma'ohinefcr screeding and compacting concrete, the combination of-a -solid'planbshaped front vibratory screed memberof substantially greater depth than -tlie thickness disposed vertically -edgewiseyasOIid planIt-Iike rear 'rnot'orsup pcrt and vibratory member of substantially greaterf'depth than thickness disposed vertically edge wise iri substantially rearwardly spaced relation toi'said: front member, said front and rear mem bers being provided with shoes 'ofa'wid'th substantially exceeding: the thickness 0f said members and" having curved" edges, resilient n'on extensible connections between said front and rear memb'e'rs whereby they coact to mutuallysupport each. other in" upright position, an unbalanced rotor mounted "on said front member, a motor mountedion the rear memberand having 'a flex'ible driving connection to said rotor; said connec tions between said front and rear members can'- stituting a vibration dampening 1 means whereby the vibration's :of'the rear" members i are 3 relatively slight as compared-to 'the vibrationsoi' warren-t member c 4. Ina machine for screeedingand coiii-pacting concrete;- the combination of a plank-shaped front vibratory screed member of substantially greater depth than" thickness disposed vertically edgewise a plank-likevrear motor 1 support and vibratory member of substantially greater depth than thickness disposed vertically edgewise in substantially rearwardly' spaced relation to said front-member, resilient non-extensible connections, between said front; and rear members whereby they coact to mutually support each other in .upright. position, antunbalanced rotor mounted; on said front member; and a motor mounte'd .omthe rear member' and having aiflexiblefdrivingi connection to saidrotor, said' co'nnections between said. front and rarflmexrib'is' cbnstituting da s-vibration dampening means whereby the! 'brations of the rear member are relatively sii hta'a compared to-the vibrations of thefif ront 5. In a machine for screeding and compacting concrete, the combination; of a. front: vibratory screed member of substantially greater depth member, a'dra-w head; pairs of draftibars pivotal;

than thickness, 21; rear vibratory"memberi'dispose'd 4 inrearwardly spaced relation: tosaid fronti'member, vibration absorbingrconnections between said-front and rear'members, means for vibrating said front member at high frequency; saidvcona nections'between said front anduearemembersj constituting a vibration dampening means where? by the A vibrations of the" rear member are: sub/ stantially less than theiivibrafionsbofl the fron't ly connected to said draw head for vertical swing; ing' movement, crossheads for the? rear" enlist of said pairs of-draw bars for raising "and lowering said front vibratory member with said crossheads"; vibration absorbing means supportinglyrconneot;

ing; said front vibratory screed n members toi said' crossheads, a resilient brace connectingltheiuppier ends of said crossheads: to= the: rear member; means for raising and lowering ,thefswihgingiends of said drawbars, and adjustable stop mean-seen said draw-head for limiting i the downwardx movm ment of saiddraft barsz d l l n 6 In ;a \mach'inefor screed-ing and-wcompacting concrete, the combination of a'rfrontvibratory screed member' ofwsubstantial1ygreater" depth than thickness, a1 rear vibratory member'iof sub stantially greater depth than thicknessidisposed in 'rearw ardly spaced; relation torsaid frontzmeme ber, vibration absorbing "connections betwe'en said frontwand rear membersameans' fot' ingsa-id front member at highrfrequency, said connections between isaidifrontan d rear members constituting avibration dampening imeanswh'erei by the vibrations of the rearmembeh 'are suW stantially less than the vibrationsvofthei front member; at-draw: head; pairsof draft .bars pivotally concrete; the combination ofia relatively thin frontv vibratory screedzmember, a1 relatively thin' rear. vibratoryimember disposed in! r'earwardly spaced relation to said frontwmember; vibration absorbing connections between said front and rear-members; and means for vibratingrsaid front member at high frequency; said";connecti'ons' l beitween said front and-rearmemberszconstituting a vibration dampening means? whereby the 'vibrations ofthe rear memberrare "substantially less than-the vibrationsof thesfront member; an :un'- balanced rotor; mounted on the dfrontiivibrastory member, a :motor; mounted on: the rear vibi atory member, andua flexible drivingts-connectione from said motor: said rotor, said i unbalanced? rotor being disposedvat the reari of thefront-vibratory ia l e te td ie than thickness disposed vertically ced g'ewise in swbstantially 'rearwardly spaced relation to said front member, resilient non-extensible connections: between said frontand rear members whereby they' coact to mutually support each oth'erin up'rightp'osition, an unbalanced rotor mounted on said front member, and a motor mounted on the rear member and having a flexible-driving connection to said rotor, said connections between 'said'front andrear members constituting a vibration dampening means whereby the vibrations ofthe rear member are relatively light as compared to thevibrations of the front member. 1

9. In a" machine for screeding and compacting concrete, thecombinati-on of a front vibratory screed member of substantially greater depth than thickness, a rear motor support member of substantially greater depth than thickness adapted to be slidably supported by the forms and disposed in rearwardly spaced relation to said front member, vibration absorbing connections between said front and rear members whereby they coact to mut'uallysupport each other in upright position, detachable shoes for said rear member whereby it may be supported in elevated position above the surface of the material at the rear of saidffront member or by *detaching said shoes adjusted to act an the material that has been acted upon by the front member, an unbalanced rotor mounted on saidfront member, and a motor mounted on the rear member and having a flexible driving connection to said rotor, said connections between said front and rear members constitutinga vibration dampening means whereby the vibrations of the rear memberare rela tively:light-ascompared to the vibrations of the front member.

1'10, In a machine for-screeding and compacting than thickness, a rear motor support member of substantially greater depth than thickness adapted 170 3138 slidably supported by the forms and'disposedinrearwardly spaced relation to said front member, vibration absorbing connections between said front and rear members whereby they coact to mutually support each other in upright position, an unbalanced rotor mounted on said front me'mbena motor mounted on the rear member and having a flexible driving connection to said rotor, ,said' connections between said front and rear members constituting a vibrationdampening means whereby the vibrations of the rear memberare=relatively' light as compared to the vibrations of the front' member, and handles mounted on i'verti-calpivots having vibration absorbing conabsorbing"'connections to said front member, said handles being swingable to different positions relative to said'fr'ont member.

l 12. In a machinefor 'screeding and compacting bon-crete, the combination of a plank-shaped "frontvibratory screed member of substantially greater depth than thickness disposed: vertically edgewise, a plank-like combined rear motor support and Vibratory member. =of substantially greater depth than thickness disposed vertically edgewise in spaced relation to said front member, resilient non-extensible vibration absorbing connections between said front and rear members, and means forvibrating the front member at-hi'gh frequency, an unbalanced rotor mounted on. the front vibratory member, a motor mounted on the rear vibratory member, and a flexible driving connection from said motorto said rotor, said utrbalanced rotor being disposed at therear 'Ofit'h front vibratory member to facilitatesaid flexible driving connection being connected I directly thereto. l w

13. In a machine for screeding and compacting concrete, the combination of a front vibratory screed member of substantially greaterdepth than thickness, a combined rearmotor support and vibratory memberof substantially greater depth than thickness in spaced relation to said front member, vibration'absorbingconnections between said front and rear members; means for vibrating the front member athigh:frequency, and handles mounted on vertical pivots :having vibration absorbing connections to said front member. r i

14. In a machine for screeding and compacting concrete, the combination of a front. vibratory screed member. of substantially greaterv depth than thickness, a rear screed member of substantially greater depth than thickness adapted to be supported by the sideforms of the material treated, vibration absorbing connections between said front andrear members, an unbalanced-rotor mounted on said front vibratory screed member, and a motor mounted on said rear vibratory screed member and having adrivingconnection withsaid'r-otor. 15. In a machine for screedingand compacting concrete, the combination with a front vibratory screed member of substantially greater .depth than thickness, a rear screed-member. -of,.-sub.- stantially greater depth than thickness disposed in rearwardly spaced relation to said front mem: ber, vibration absorbing connectionsbetween said front and rear member, a motor mounted 'onsaid rear vibratory screed member, a vibrating unit on said front vibratory screed member, flexible belt driving connection between said m'otorto said vibratory unit onsaid front member, and propelling means having vibration absorbing connection tosaidfrontmember. v1 j CORWILL JACKSON v REFERENCESCITED: The following references'a're of record in the file of this patent: 1 V I UNITED STATES PATENTS, l

Number Name 1 Date" 5; 1,819,866 Cameron Aug. 18, 1931 2,034,942 Dodds Mar. 24-, 1936 2,141,301 Jackson Dec. 27, 1938 2,145,959 Venable Feb. 17; 1939 2,214,093 1 Venable 'Sept. ,"10',*1940 2,248,247 Nichols 1 July 8,1941 2,306,126 Jackson Dec. .22, 1942 2,314,985. Jackson Mar. 30',l'1943 2,322,362 Jackson 1; June 22, 1943 2,346,378 ,Jackson, Apr. 11, 1944 2,400,321 Troxell May 14,-,1946 

